You want to rollback to previous version of your entire development instance or some tables?
For this you need to raise a HI ticket to rollback to the version you want.
There are snapshots of your entire instance for last 28 days which are kept as backup if something wrong happens to your present instance.
How is data backed up, and how often?
For production instances, data is backed up to disk within that instance’s data center pair. Sub-production instances exist in and are backed up to a single data center only. Full backups are taken weekly, with incremental backups made daily in between.
How long is backed up data kept?
Backups are maintained for 28 days
Does ServiceNow take tape backups offsite?
Data is backed up to disk, not tape, and remains within the data centers. Production ServiceNow instances are backed up in each data center in a regional pair, each location providing offsite backup storage for the other.
Can customers restore data if they need to?
Customers can restore data if they need to. However, the Advanced High Availability (AHA) Architecture means that restores are only relevant in specific situations, e.g. if a customer accidentally deletes data from an instance. Individual items such as tables or fields can be restored from within the platform. Customer Support can assist in the very rare situation where an entire instance needs to be restored as a last resort
attaching reference
https://www.servicenow.com/content/dam/servicenow-assets/public/en-us/doc-type/resource-center/data-...
Hope this is helpful
Regards,
Anshu
