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SO on SSD. Backup from HDD to a NAS by network. Is SSD affected by read/write backup operations?

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I have Win7 + Acronis Backup installed on a SSD.
A secondary HDD contains my data and I backup it on a external NAS on my home network.
If I run backup on Win7 SSD is the SSD affected by read/write backup operations that shorten its worklife?

Thank you
Regards.

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You should not worry about read/write operations numbers that would lessen the life of your SSD. Even if you were to write to *all* sectors of your SSD every day, you would keep your SSD for about 10 years. As you can see when you backup your SSD using Acronis, you might change a few GB every day...
What is important is to use a SSD on a modern OS (Windows 7 or later) to use the TRIM function, and to have your SSD aligned. If your SSD came with your modern OS, or you formatted your SSD with a modern OS, your SSD is very likely aligned. TRIM and alignment make sure you benefit from the top performance of you SSD. If you have doubt about your SSD alignment let us know, it is easy to verify.

Don't worry about changing or tweaking OS files like the pagefile, hibernation file or other indexes, for fear of "wearing out" the SSD.

Anyway, to answer your question, a backup operation doesn't write a lot of things on the disk it is backing up. The ATI technology might create some temporary files depending on the conditions, but it is marginal. The vast majority of the work is read operations.