I wouldn't be surprised if your backup is being made by "others".
To figure that out, you could set up a trace to capture backup details.
You could even get a first glimps of it looking at the backup history data:
declare @DbNameLike sysname
declare @OnlyLastBUset bit
Select @DbNameLike = '%' -- = 'insite_coil'
, @OnlyLastBUset = 1
, BU.name as BUName
, case BU.[TYPE]
when 'D' then 'Full'
when 'I' then 'Diff'
when 'L' then 'Log'
when 'F' then 'File or filegroup'
when 'G' then 'Diff file'
when 'P' then 'Partial'
when 'Q' then 'Diff partial'
end as BuType
, CAST(BU.backup_size / 1024 / 1024 as decimal(18, 3)) as backup_size_MB
/* SQL2008 added compressed_backup_size */
--, CAST(BU.compressed_backup_size / 1024 / 1024 as decimal(18, 3)) as COMPRESSED_BU_size_MB
/* SQL2005 added BU.recovery_model */
-- hebben we niet in gebruik , BU.expiration_date
from msdb.dbo.backupset BU
inner join msdb.dbo.backupmediaset BS
on BS.media_set_id = BU.media_set_id
inner join msdb.dbo.backupmediafamily BMF
on BMF.media_set_id = BU.media_set_id
left join (
select @@ServerName as Server_Name
, D.name as DbName
, max(BU.backup_start_date) as Last_backup_start_date
, max(BU.backup_finish_date) as Last_backup_finish_date
from master.dbo.sysdatabases D
left join msdb.dbo.backupset BU
on D.[Name] = BU.database_name
and BU.[type] = 'D' -- D = FullDatabasebackup
group by D.name
--order by D.name
On LastFullBU.Server_Name = BU.server_name
and LastFullBU.DbName = BU.database_name
where BU.backup_start_date > DATEADD(MM, datediff(MM, 0, getdate()) - 1, 0) /* Sinds begin vorige maand */
and BU.database_name like @DbNameLike
and BU.backup_start_date >= case @OnlyLastBUset
when 1 then dateadd(mi, -15, LastFullBU.Last_backup_start_date)
order by case when BU.[TYPE] in ( 'D', 'I', 'L', 'F', 'G', 'P', 'Q' ) then 1
, BUName ;
Maybe the BU.[user_name] column can give you a hint.
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