Offsite Backups
After initializing the VPG, Zerto Virtual Replication periodically checks that the schedule to run an offsite backup has not been passed, either a daily offsite backup or a weekly offsite backup. At the scheduled backup time, the offsite backup is run and the offsite backup file stored in the specified repository.
Offsite backups are kept on the recovery site for the retention period specified in the VPG. However, over time the number of stored offsite backups is reduced to save space.
The number of stored offsite backups for daily backups is as follows:
Retention period | Daily | Weekly | Monthly | Number of Backups | Maximum Number of Days to Oldest Backup |
1 week | 7 | 0 | 0 | 7 | 7 |
1 month | 7 | 4 | 0 | 11 | 35 |
3 months | 7 | 4 | 2 | 13 | 91 |
6 months | 7 | 4 | 5 | 16 | 175 |
9 months | 7 | 4 | 8 | 19 | 259 |
12 months | 7 | 4 | 11 | 22 | 343 |
That is, an offsite backup is kept for each day for the current week and then the oldest offsite backup for the previous week is kept for the previous four weeks and then the oldest monthly backup is kept for the rest of the retention period.
The number of stored offsite backups for weekly backups is as follows:
Retention period | Weekly | Monthly | Number of Backups | Maximum Number of Days to Oldest Backup |
1 week | 1 | 0 | 1 | 7 |
1 month | 4 | 1 | 5 | 58 |
3 months | 4 | 3 | 7 | 121 |
6 months | 4 | 6 | 10 | 205 |
9 months | 4 | 9 | 13 | 289 |
12 months | 4 | 12 | 16 | 373 |
That is, an offsite backup is kept for each week for the current month and then the oldest backup for the month is kept and then the oldest monthly backup is kept for the rest of the retention period.