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| Warning |
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If the device has a directory named "flash" in its file list, then files which you want to be kept after the system reboot/power cycle must be stored within it. As anything outside of it is kept within a RAM disk and will be lost upon reboot. This does not include .npk upgrade files as they will be applied by the upgrade process before the system discards the RAM drive content. |
| Note |
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For multicore devices with a NAND flash memory (e.g. CCR series routers, RB4011iGS), RouterOS uses a write-back which will cache file changes into RAM memory instead of writing them straight away into flash media. The file changes will be stored on the flash when it is absolutely necessary, the writing can be delayed by up to 40 seconds. This helps to reduce CPU cycles which results in better performance. However, this can cause empty or zero-length files when a device gets unexpectedly rebooted (e.g. by a power cut) because files were not fully saved on a flash. |
Backups
RouterOS backup feature allows you to save the current device's configuration, which then can be re-applied on the same or a different identical model. This is very useful since it allows you to effortlessly restore device's configurations or to re-apply the same configuration on a backup device. The system's backup file also contains the device's MAC addresses, which are also restored when the backup file is loaded.
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