Exchange 2010 SP3 upgrade

[JohnGG]

Gday people, we are going to do an Exchange 2010 SP3 upgrade this weekend (Currently SP1).
What i need to know is it safe to roll back if anything goes wrong? I am seeing people say that i will have issues as it does a Schema update as well.
I will be backing up with BackupEXEC 2010 of all databases and also System state of both mail and Schema master.

Is there anything i need to look out for?

[veremin]

Prior to upgrade initiate a backup cycle. If anything goes wrong, leverage quick rollback functionality. Thanks.

[JohnGG]

So when you say backup do you mean replication because im replicating each server every night.
Also what about schema in active directory?

EDIT:Also i cannot find anything about restoring emails, databases using Replica's its always taking about backups of which we do not perform we only do replications.
Is this the same method? I just dont want to ruin 1 terabyte of emails and have a 100 users come monday screaming at me thats all.
Also im using Veeam version 7

[JohnGG]

Ok im going to do a backup of the exchange server to a 3 terabyte USB drive just in case.

[JohnGG]

Well everything looked like it was working backing up to disk but it says its transfered 16 gig but the file size is only 16 meg.
Could it be the formated size of the disk? Im running out of time to get responses for this issue (16 hours before i do SP3 update)

God dam now it isn't stopping this backup job after 30 minutes waiting!

[JohnGG]

Well i rebooted server, formatted USB drive, created all new backups and a new repository pointing to USB drive and now it just sits there after 40 minutes at "Change Block Tracking enabled".
What the hell am i doing wrong? it worked fine testing it on a network share on my own PC.

Bytes Per Sector : 512
Bytes Per Cluster : 4096
Bytes Per FileRecord Segment : 1024

From logs
Checking whether storage to prepare is closed.

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[04.12.2015 14:11:48] < 10976> cli| Thread started. Thread id: 10976, parent id: 9860, role: MTA invoke thread
[04.12.2015 14:11:48] < 10976> cli| Entering MTA invoke thread.
[04.12.2015 14:11:48] <  9860> cli| MTA backup apartment was created successfully, id '0x0162c620'.
[04.12.2015 14:11:48] < 10976> stg|   There is no file 'HostFS://E:\Backups\WebServer\WebServer2015-12-04T141147.vbk' in the files cache.
[04.12.2015 14:11:48] <  9860> stg| Upgrading/fixing storage [E:\Backups\WebServer\WebServer2015-12-04T141147.vbk]. Standard block size: [1048576]. Block alignment logarithm: [0].
[04.12.2015 14:11:48] <  9860> stg|   Opening storage [E:\Backups\WebServer\WebServer2015-12-04T141147.vbk] for read/write access.
[04.12.2015 14:11:48] <  9860> stg|     File [E:\Backups\WebServer\WebServer2015-12-04T141147.vbk] does not exist.
[04.12.2015 14:11:48] <  9860> stg|     Opening storage file [HostFS://E:\Backups\WebServer\WebServer2015-12-04T141147.vbk].
[04.12.2015 14:11:52] <  9860> stg|     Initialized bank cache.
[04.12.2015 14:11:52] <  9860> stg|     Bank cache limits: 
[04.12.2015 14:11:52] <  9860> stg|       Dirty: [205]
[04.12.2015 14:11:52] <  9860> stg|       Clean: [229]
[04.12.2015 14:11:52] <  9860> stg|       Overall: [261]
[04.12.2015 14:11:52] <  9860> stg|     Dedupe disabled: [false].
[04.12.2015 14:11:52] <  9860> stg|     Prepared dynamic load bank factory, using bank cache.
[04.12.2015 14:11:52] <  9860> stg|     Allocating space for new banks in slot [4096]. Already allocated banks number: [0]. Additional banks number: [2].
[04.12.2015 14:16:43] <  9860> stg|     Allocating space for new banks in slot [53248]. Already allocated banks number: [0]. Additional banks number: [2].
[04.12.2015 14:16:46] < 12892> cli| Number of sessions: 3. Interval: 299 sec. 
[04.12.2015 14:19:25] <  9860> stg|     Slot [4096] should be rewritten with new metadata. Number of banks: [2]. Version: [1].

[JohnGG]

more

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[04.12.2015 14:16:46] < 12892> cli| Number of sessions: 3. Interval: 299 sec. 
[04.12.2015 14:19:25] <  9860> stg|     Slot [4096] should be rewritten with new metadata. Number of banks: [2]. Version: [1].
[04.12.2015 14:21:46] < 12892> cli| Number of sessions: 3. Interval: 599 sec. 
[04.12.2015 14:23:25] <  9860> stg|     Slot [53248] should be rewritten with new metadata. Number of banks: [2]. Version: [1].

retried again and now it appears to be working but 1 meg read @ 1 meg a second and appears to have stopped!!

[JohnGG]

Ok i suspect the USB drive has failed or failing so trying another one now.

[JohnGG]

Must have been the USB drive as it appears to be working as it should now, see how i go!

[foggy]

EDIT:Also i cannot find anything about restoring emails, databases using Replica's its always taking about backups of which we do not perform we only do replications.
Is this the same method?

Yes, you can use Veeam Explorer for Exchange to restore Exchange items after manually restoring database file from replica.