1. A method comprising: initiating a backup operation of data including a plurality of items; interrupting the backup operation after a portion of the data is backed up; associating the backed up data with a timestamp; receiving an input to resume the backup operation; comparing the timestamp with a timestamp of a last completed backup operation; based on the comparing, resuming the backup operation to back up a remaining portion of the data; monitoring for modifications to one or more items of the plurality of items during the backup operation; completing the backup operation; and performing a second backup for modified items, where the method is performed by one or more processors.