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+The situation: I have built some cosmic ray detectors that store the data in influxdb on device, using a Raspberry Pi with SD Card. The SD cards died en route as a result of power cycling. So the expedition crew changed them periodically. Also we got some data in real time via Starlink, but only for a couple of hours a day. 
+The result: I have my online influxdb, which has all events received via starlink. I have three SD cards with varying degrees of 'offline' data, in the format of raw influxdb files (shards, not portable etc.)
+I was getting failures with the following errors in the influxd status:
+août 03 00:15:53 beast influxd[4142]: ts=2024-08-02T22:15:53.720580Z lvl=info msg="Failed to open>
+This is due to incorrect permissions to /var/lib/influx, the fix is below.
+The solution:
+1) Copy the files off the SD cards. This requires a linux instance, mounting the cards and then modifying the permissions (sudo chmod -R 777 /var/lib/influx/ and then sudo chown user:user /var/lib/influx/) and copying the files to a safe place (sudo cp -r /var/lib/influx/ ~/Documents/influx_backup_number_etc)
+2) install influxd on the host machine (sudo apt-get install influxdb)
+3) copy the files back to the /var/lib/influx directory
+4) Reset the permissions as here https://docs.influxdata.com/influxdb/v1/introduction/install/
+(sudo chmod -R 755 /var/lib/influxdb/ and sudo chmod -R 700 /var/lib/influxdb/wal/ and sudo chown -R influxdb:influxdb /var/lib/influxdb/)
+5) Restart the local influxd (sudo systemctl restart influxd)
+6) Create a portable backup in a new safe place (influxd backup -portable ~/Documents/influx_2_portable_bak)
+7) next step - follow the instructions here to merge everything into a master dataset: https://community.home-assistant.io/t/influxdb-and-merging-multiple-backups/515602
+
+Useful sources:
+https://community.influxdata.com/t/recovering-data-after-a-disk-failure/3590
+https://docs.influxdata.com/influxdb/v1/tools/influx_inspect/