Thanks for the reply @meher @Albot!
I again run the backup and monitored the aerospike.log file. Found that scan was not able to get the key of few record following is the log I observed:
Dec 05 2021 06:19:25 GMT: INFO (scan): (scan.c:618) starting basic scan job 9937657453902658616 {temp_ns:SET1} priority 2, sample-pct 100
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18749440
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1231) load_n_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18749440
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1249) load_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18749440
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1280) get_key: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (proto): (proto.c:329) can't get key - skipping record
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18114560
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1231) load_n_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18114560
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1249) load_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18114560
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1280) get_key: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (proto): (proto.c:329) can't get key - skipping record
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18167808
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1231) load_n_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18167808
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1249) load_bins: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1194) read: bad block magic offset 18167808
Dec 05 2021 06:19:25 GMT: WARNING (drv_ssd): (drv_ssd.c:1280) get_key: failed ssd_read_record()
Dec 05 2021 06:19:25 GMT: WARNING (proto): (proto.c:329) can't get key - skipping record
Is this the fix?