What are the issues with timing sync and clearing cache?

Because there is a situation in my project where files cannot be saved to disk after being written, these two scripts have been added in the background. Will they have any impact on system performance?

My device may frequently experience abnormal power outages instead of rebooting or shutting down. I hope that data written to a file 1 second before the abnormal power outage can also be saved to the disk, but the actual situation is that it often fails to be saved to the disk.

My device has UPS(Uninterruptible Power System). I am using C++programming.

autoSync.sh:

#!/bin/sh

while true; do
    sync
    sleep 1
done

autoCacheFree.sh:

#!/bin/sh

drop_caches() {
    echo "Drop caches."
    sync
    echo 1 > /proc/sys/vm/drop_caches &
    return 0
}

while true; do
    sleep 600
    drop_caches
done

/etc/fstab:

#device         mount-point     type    options         dump    fsck order
/dev/mmcblk3p3  /dobot          ext3    defaults                0       0
/dev/mmcblk3p6  /dobot/userdata ext3    defaults                0       0
proc            /proc           proc    defaults                0       0
tmpfs           /tmp            tmpfs   defaults                0       0
sysfs           /sys            sysfs   defaults                0       0
tmpfs           /dev            tmpfs   defaults                0       0
var             /dev            tmpfs   defaults                0       0
ramfs           /dev            ramfs   defaults                0       0