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#1131
You would be safer doing differential backups than incremental. Incremental backup rely on the full backup and all incrementals. Differentials rely on the full backup and on differential. I personally do one full backup per week and daily differentials. The paid version of macrium has a storage management option. I chose to keep three full backups and their associated differentials.
Kaktussoft is correct. The image is not bootable, it is just a file. You need to create a recovery disk to restore it. The WinPE recovery disk is more reliable and has more features than the Linux one.