It is a good idea to have a copy on an “air gapped” medium e.g. Having a backup application make multiple secondary copies is essential in guaranteeing that recovery is possible. Much like any data loss scenario, ransomware affects primary data copies. This can be invaluable in detecting that a ransomware attack is in progress. Backup applications that allow for a “percentage change threshold” will not perform the backup if the incremental change is greater than the threshold.This can serve as an early warning sign of an attack. However, when ransomware strikes, there will be a spike as a large number of files will be encrypted and get picked up for backup.For example, it can be expected that after the first full backup, incremental changes will be in the 10%-15% range. Incremental backups tend to be consistent in terms of change percentages. Backup applications work by performing an initial full sync and then incremental backups after that.Ensure your backup application can roll back individual files and more importantly entire volumes to a previous point in time. Snapshots can be enabled via backup apps or via the backup target. Snapshots are also critical to recovering from a ransomware attack. Thus, if you get hit by ransomware, the encrypted files will not be picked up ensuring you have clean backups with ready restore points. *.jpg, *.jpeg, *.bmp etc.) ensures that only those files will be picked for backup. For example, if your job is backing up image files, then having a whitelist of image files (e.g. A backup application that supports ransomware whitelists ensures that only those file types that need to be backed up are protected. Locking ransomware works by encrypting your files to a new file-extension.
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