We currently do an incremental backup each weekday, with an active full backup once a week, and are keeping 10 restore points. That gives us access to daily backups for the last two weeks.
We'd like to keep more restore points, but don't have the disk space, so we're thinking of changing to Reverse Incremental. I'd like to know:
- how many more restore points that will let us have
- what happens to future active full backups
- what happens to existing full backups
- what will be the impact on disk space during the first two weeks
At the moment we have these files in the repository:
07/06/2017 05:18 AM 1,518,283,966,464 Backup Job 1 - mainD2017-06-06T210114.vbk
08/06/2017 12:59 AM 67,000,223,744 Backup Job 1 - mainD2017-06-07T210144.vib
09/06/2017 12:47 AM 73,356,963,840 Backup Job 1 - mainD2017-06-08T210115.vib
10/06/2017 12:38 AM 70,295,049,216 Backup Job 1 - mainD2017-06-09T210117.vib
13/06/2017 12:36 AM 74,783,447,552 Backup Job 1 - mainD2017-06-12T210057.vib
14/06/2017 05:08 AM 1,515,549,227,520 Backup Job 1 - mainD2017-06-13T210103.vbk
15/06/2017 12:41 AM 75,472,141,824 Backup Job 1 - mainD2017-06-14T210100.vib
16/06/2017 12:44 AM 82,936,717,312 Backup Job 1 - mainD2017-06-15T210104.vib
17/06/2017 12:42 AM 73,508,951,552 Backup Job 1 - mainD2017-06-16T210056.vib
20/06/2017 12:52 AM 90,038,958,080 Backup Job 1 - mainD2017-06-19T210058.vib
21/06/2017 06:17 AM 1,541,633,617,920 Backup Job 1 - mainD2017-06-20T210103.vbk
22/06/2017 12:47 AM 70,325,822,464 Backup Job 1 - mainD2017-06-21T210222.vib
You can see we have three full backups of about 1.5TB in there, and 9 incrementals averaging about 80GB. I assume it's keeping 11 files because the 4 oldest incrementals need the oldest full, and that tomorrow there will be 12 files, then 13, etc, until it finally removes the oldest active full and all its incrementals.
If I reconfigure the backup to Reverse Incremental, will it immediately convert the latest incremental to a full, and all the previous files to reverse incrementals? Or does nothing happen till after the next backup? If the latter, does it convert all the files, or only the backups done snce the change?
And what happens to future active full backups? Do they still get converted to reverse incrementals after the next backup?
At the moment, the main reason for doing weekly active full backups is so that we can then back it up on tape the next day. I assume with Reverse Incrementals, we could do them much less often, and that they are perhaps not even necessary. Correct?